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UCC28950: Tradeoffs of using an MCU vs. UCC28950PWR for PSFB Control

JSly
Intellectual 410 points
Part Number: UCC28950
Other Parts Discussed in Thread: UCD3138, UCC28951-Q1, UCC28951

Hello everyone,

Right now I'm working on determining the architecture for the 1.5kW phase shifted full bridge converter I'm working on for an automotive application. I came across the UCC28950 and saw it supports ZVS and synchronous rectification. Looks like a robust solution and it would eliminate the software development side of this project. What I initially had in mind was to use an MCU for receiving sensor feedback and generating the gate signals, but that would be great if I could use UCC28950. For those who have designed DCDCs before, why use a MCU when controller ICs like this are available? What are the tradeoffs? 

Thanks!

J

  • 0
    TI__Guru* 86266 points

    Hello,

    Using MCU and digital control such as the UCD3138 for a phase shifted full bridge give you some flexibility of some computing power/programing.  You could build in your own special functions if you wanted.  However, many designers still prefer mixed signal power supply controllers to control there power converter.  The mixed signal control ICs have a tendency to be cheaper than the MCU based solutions.

    The  UCC28950/1 both are available in Q1 versions of automotive.  The UCC28951-Q1 is the newest of the two devices and I suggest that you use this one for your application.  There are many design tools that can help with your design.

    Webench Designer can be found at the following weblink.  Just scroll down and you will find it. You enter your input and output requirements.  Webench will generate a schematic, BOM and even information that are needed for designing magnetics.

    There is an application note using the UCC28950 in a 2 kW design that you may find useful at the following link.

    There are also Tina and spice models available for the UCC28951 as well that you might find useful at the following link.

    Regards,